Electronic Properties of Polymeric Sulfur Nitride

We present a three-dimensional band-structure calculation of ${\left(\mathrm{SN}\right)}_x$ using the empirical pseudopotential scheme. The density of states, Fermi surface, and optical spectrum are calculated. Estimates for the electron-phonon coupling constant $\lambda$ are given and the increase of $T_c$ with pressure is discussed. The assumption of an electron-phonon mechanism for superconductivity in ${\left(\mathrm{SN}\right)}_x$ is consistent with our results.